106 NICKOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE
One 1 Ib. tin of condensed milk for each person the boat is certified
to carry.
One dozen self-igniting red lights in a watertight tin, and a box
of suitable matches in a watertight tin.
14. What is a rowlock?
A rowlock is a small open space on top of the gunwale made to
provide a suitable place for shipping and pulling the oars in. It may
be formed by pieces of wood fitted on the gunwale, or by pieces being
cut out of the gunwale. Rowlocks are often fitted in naval boats, and
in those used by fishermen and watermen, but not in boats of the
Mercantile Marine. The latter are fitted with "crutches" or "thole-
pins" which serve the same purpose.
15. What are the regulations relating to the mast?
It must be a Norway spar, the length of which is not to exceed two-
thirds the length of the boat.
It should be fitted with the necessary stays and sheaves.
The sheave for lugsail halyard should be not less than 12 inches
above the yard when the sail is set, and the jib halyard sheave should
be not more than 12 inches below the truck.
16. What is meant by an approved life-buoy?
An approved life-buoy shall be of solid cork or other equivalent
1 material. It shall be capable of floating in fresh water tor at least
24 hours with 32 Ibs. of iron suspended from it.
It shall be painted in good distinguishable colours such as white or
red.
The inside diameter shall not be less than 18 inches.
It shall be fitted with beckets securely seized on to it. At least one
on each side of the ship shall be fitted with a life-line not less than 15
fathoms in length.
17. What are the general specifications of efficient life-boats?
They must be properly constructed with materials approved by
the Board of Trade, and be of such form and proportions that they
have ample stability in a seaway, and sufficient freeboard when loaded
with their full complement of passengers and equipment.
Their structural strength must be sufficient to permit them being